body,ul,ol,p,h1,h2,h3,h4,h5,h6 {
  margin:0;
  padding:0;
}
ul,ol{
  list-style: none;
}
img{
  vertical-align: middle;
}
a{
  text-decoration: none;
}


:root{
  --background-color:#409EFF;
  --menu-background-color:#263238;
  --scale-num:1.5;
}
html{
  font-family: '微软雅黑';
}